"<p>In this article, we'll break down a simple Node.js API using Sequelize, a promise-based ORM for Node.js, to perform CRUD (Create, Read, Update, Delete) operations on a Post model.</p> <h4>1. Importing the Post Model</h4> <pre class="language-javascript"><code>import Post from "../models/Post.js"</code></pre> <p>Here, we import the Post model from our application.</p> <h4><strong>2. Fetching All Posts</strong></h4> <pre class="language-javascript"><code>export const getAllPosts = async (req, res) => { const posts = await Post.findAll(); res.status(200).json(posts); } </code></pre> <p>This function retrieves all posts from the database and sends them as a JSON response with a 200 status.</p> <h4><strong>3. Adding a New Post</strong></h4> <pre class="language-javascript"><code>export const addPost = async (req, res) => { const { content, isPublished } = req.body; const post = await Post.create({ "content": content, "isPublished": isPublished, "userId": 1 }); res.status(201).json(post); } </code></pre> <p>Here, we add a new post to the database with content and publication status provided in the request body. The created post is then sent as a JSON response with a 201 status.</p> <h4><strong>4. Updating a Post</strong></h4> <pre class="language-javascript"><code>export const updatePost = async (req, res) => { const postId = req.params.id; const { content } = req.body; let post = await Post.findOne({ where: { id: postId } }); post.content = content; await post.save(); return res.status(200).json(post); } </code></pre> <p>This function updates the content of a post specified by the provided ID. The updated post is then sent as a JSON response with a 200 status.</p> <h4><strong>5. Deleting a Post</strong></h4> <pre class="language-javascript"><code>export const deletePost = async (req, res) => { const postId = req.params.id; let post = await Post.findOne({ where: { id: postId } }); if (post) { post.destroy().then((result) => { return res.status(204).json(result); }); } else { return res.status(404).json({ message: "Post not found" }); } } </code></pre> <p>This function deletes a post based on the provided ID. If the post exists, it is deleted, and a 204 status is sent as a response. If the post is not found, a 404 status with a corresponding message is sent.</p> <p>Understanding and implementing CRUD operations is fundamental for any application dealing with persistent data. Sequelize, with its intuitive syntax, makes these operations straightforward in a Node.js environment. By following this article, you've gained insights into building a basic API with Node.js and Sequelize, setting you on the path to creating more robust applications with ease. Happy coding!</p>"